Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Patent
1997-08-06
1999-06-01
O'Shea, Sandra
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
313506, 313512, 345 76, 3151693, 428917, H05B 3304, H05B 3314
Patent
active
059090812
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a multi-color light emission apparatus and a method for producing thereof. More specifically, this invention relates to a multi-color light emission apparatus suitable for use in multi-color or full-color thin-type displays and a method for producing the multi-color light emission apparatus.
DESCRIPTION OF THE BACKGROUND ART
An electroluminescence device (hereinafter called "EL device") is characterized in exhibiting high visibility due to self-emission and in having excellent impact resistance because of being completely solid. At present, variable EL devices using an inorganic or an organic compound as the emitting layer are proposed and attempts have been made to put them to practical use. One of the EL devices which has been realized is applied as a multi-color light emission apparatus.
Such a multi-color light emission apparatus includes an apparatus produced by combining a color filter of three primary colors (red, green, and blue) with a white-light emitting inorganic EL device and an apparatus produced by patterning inorganic EL devices of three primary colors in order to position the EL devices of three primary colors separately on the same plane and thereby to emit light (Semicond. Sci. Technol. 6 (1991) 305-323) However, there is the problem that the effect of emitting light of each color is limited to 33% of the white light at most if the white color is resolved by the color filter of three primary colors. Further, EL devices which themselves can efficiently emit white light have still not been attained at present.
On the other hand, a photolithography process is used for patterning EL devices. However, it is known that the efficiency and stability of EL devices are greatly reduced in such a wet process.
It is common knowledge that, among EL devices, organic EL devices are promising as highly intense and efficient light emitting devices. In particular, because the light emitting layer is an organic layer, it is highly probable that various emitting colors are produced by the molecular design of organic compounds. Such an organic EL device is expected to be one device which can be used in practice in a multi-color light emitting apparatus.
However, these organic EL devices have the drawback that chemical factors such as external steam, oxygen, organic compound gas, and the like cause deterioration of the EL devices such as reduction in luminance accompanied by the occurrence of dark spots and the like and these devices tend to be destroyed from physical (mechanical) factors such as heat, impact, or the like since the EL devices are composed of a laminate of low molecular organic compounds.
Therefore, the method for separately disposing each of the organic EL devices, which emit lights of three primary colors (RGB), on the same plane can be used in a wet process or a process including heat treatment such as a photolithography process only with difficulty.
In order to solve such a problem, disclosed is a color EL display apparatus (see Japanese Patent Application Laid-open No. 40888/1989). This apparatus is, as shown in FIG. 8, characterized in that an EL emitting layer 1b sandwiched between a lower electrode 1c and a light transmitting upper electrode la is disposed on a substrate 2, the EL light which is output via the light transmitting electrode la is externally output from a transmitting substrate 8 via a color filter 9 installed on the transmitting substrate 8, the color filter 9 facing the transmitting electrode 1a.
This apparatus has, however, the disadvantage that the luminance of the light of each color is reduced to one third of the EL light by the color filter. Also, because the EL device faces the color filter, the light emission life of the EL device is invariably reduced by aqueous vapor, oxygen, gas from organic monomers, low molecular components, and the like generated by the color filter.
To solve these problems, lately disclosed is a technique in which a fluorescent layer absorbing light emitted from an organic EL device and e
REFERENCES:
patent: 5294870 (1994-03-01), Tang et al.
patent: 5693956 (1997-12-01), Shi et al.
Eida Mitsuru
Matsuura Masahide
Tokailin Hiroshi
Day Michael
Idemitsu Kosan Co. Ltd.
O'shea Sandra
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